A group of experts have released an opinion this week that Leonardo da Vinci may have painted a nude version of the Mona Lisa, the Telegraph reports. Researchers point to the artist’s work Joconde Nue as bearing a striking similarity to the sitter in Da Vinci’s famed portrait. “The drawing has a quality in the way the face and hands are rendered that is truly remarkable. It is not a pale copy,” says curator Mathieu Deldicque. “We are looking at something which was worked on in parallel with the Mona Lisa at the end of Leonardo’s life.”